What are the top 10 historical districts with high real estate value worldwide?

1. Upper East Side, Manhattan, New York City, USA
2. Mayfair, London, United Kingdom
3. Le Marais, Paris, France
4. Tribeca, Manhattan, New York City, USA
5. Zona Sul, Rio de Janeiro, Brazil
6. Shibuya, Tokyo, Japan
7. Baixa, Lisbon, Portugal
8. Beacon Hill, Boston, USA
9. Gamla Stan, Stockholm, Sweden
10. Sydney CBD, Sydney, Australia